Nowadays Pumps working as Turbines (PaT) are devices widely used to perform energy recovery in hydraulic grids, thus improving their overall efficiency, and to build small hydropower plants. In this work, a centrifugal pump has been numerically investigated in turbine operating mode by means of the open-source CFD code OpenFOAM with emphasis on the flow field at the runner outlet. Due to the reduced number of blades in a PaT, the mean outlet relative velocity angle differs from the blade angle. In order to account for this phenomenon, the slip factor is introduced. The slip factor is investigated and its application to a 1D model is shown in order to highlight the improvement in predicting the characteristic curve of a centrifugal pump used in reverse mode as a turbine (PaT) especially at its part-load.
How to Improve the Performance Prediction of a Pump as Turbine by Considering the Slip Phenomenon / Capurso, Tommaso; Stefanizzi, Michele; Torresi, Marco; Pascazio, Giuseppe; Caramia, Giovanni; Camporeale, Sergio M.; Fortunato, Bernardo; Bergamini, Lorenzo. - In: PROCEEDINGS. - ISSN 2504-3900. - ELETTRONICO. - 2:11(2018). (Intervento presentato al convegno The 3rd EWaS International Conference on Insights on the Water-Energy-Food Nexus tenutosi a Lefkada Island, Greece nel June 27-30, 2018) [10.3390/proceedings2110683].
How to Improve the Performance Prediction of a Pump as Turbine by Considering the Slip Phenomenon
Capurso, Tommaso;Stefanizzi, Michele;Torresi, Marco;Pascazio, Giuseppe;Caramia, Giovanni;Camporeale, Sergio M.;Fortunato, Bernardo;
2018-01-01
Abstract
Nowadays Pumps working as Turbines (PaT) are devices widely used to perform energy recovery in hydraulic grids, thus improving their overall efficiency, and to build small hydropower plants. In this work, a centrifugal pump has been numerically investigated in turbine operating mode by means of the open-source CFD code OpenFOAM with emphasis on the flow field at the runner outlet. Due to the reduced number of blades in a PaT, the mean outlet relative velocity angle differs from the blade angle. In order to account for this phenomenon, the slip factor is introduced. The slip factor is investigated and its application to a 1D model is shown in order to highlight the improvement in predicting the characteristic curve of a centrifugal pump used in reverse mode as a turbine (PaT) especially at its part-load.| File | Dimensione | Formato | |
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